How to make repeating drop-down lists in word?

ChaserHUN To do that you would would have to identify the dropdown list control by inserting a bookmark around it and then, in the other document, you would need to insert an INCLUDETEXT field that takes as its argument to full name (path/filename.extension of the document containing the dropdown list plus the bookmark,  The first screen shot below shows the field code for the INCLUDETEXT field in the document on the left and the dropdown list in the document on the right that has been bookmarked with DDList

The second screenshot shows the result of the INCLUDETEXT field when the field code is toggled off.

After making a change in the dropdown list, it will be necessary to update the fields in the document containing the INCLUDETEXT field so that the change is reflected in that field.